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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a9908169e6de3c8de9fa4e9581016bfe094c90e957536cb39eb3062d96276ac2' 
  AND token = 'YvvYcJv0+j7i0MFNVH89B9feHd4nZ2z1o5/dArEh1lg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}